Top tip: If you are worried about coronary artery disease it is far more useful to have a coronary CT angiogram done. Noninvasive, simple iV contrast bolus image. Conventional angiography is far too risky and not worth the diagnostic yield in people who are asymptomatic. Non contrast CT (aka imaging done to estimate CAC) is incomplete because non-calcified atherosclerotc plaques exist (if jot this majority in younger adults).